The structural behavior of welded tee end connections used for circular hollow sections (CHS), depends on the number and the position of the tee webs. International specifications, such as ANSI/AICS and CIDECT Design Guide, provide design rules for joints made with one or two parallel tee webs, whereas the use of cross tee webs is not taken into consideration. However, the performance of such extensively employed connections cannot directly be referred to that of single tee web connection, as confirmed by the uniaxial tensile tests presented in this paper. A numerical model, based on a nonlinear Finite Element approach, is also introduced to show the influence of some geometrical parameters on the structural efficiency of the joints. As a result, a possible extension of the current design rules for CHS connections is also suggested.